# The following atomic absorption results were obtained for determinations of Zn in multivitamin tablets. All absorbance values

## Question:

The following atomic absorption results were obtained for determinations of Zn in multivitamin tablets. All absorbance values are corrected for the appropriate reagent blank (c_{Zn} = 0.0 ng/mL). The mean value for the blank was 0.0000 with a standard deviation of 0.0047 absorbance units.

(a) Find the mean absorbance values for the 5.0- and 10.0-ng/mL standards and for the tablet sample. Find the standard deviations of these values.

(b) Find the least-squares best line through the points at cZn = 0.0, 5.0, and 10.0 ng/mL. Find the calibration sensitivity and the analytical sensitivity.

(c) Find the detection limit for a k value of 3. To what level of confidence does this correspond?

(d) Find the concentration of Zn in the tablet sample and the standard deviation in the concentration.

## Step by Step Answer:

**Related Book For**

## Fundamentals Of Analytical Chemistry

**ISBN:** 9780357450390

10th Edition

**Authors:** Douglas A. Skoog, Donald M. West, F. James Holler, Stanley R. Crouch